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The aims of this study are to obtain a suitable method and a proper mesh for investigation of the temperature distribution and heat transfer. The relative errors of temperature distribution and heat transfer for each mesh are acquired in accordance with linear finite element (FEM 3), square finite element (FEM 6), cubic finite element (FEM 10), and finite difference method (FDM). It has been found that FEM 10 is the most accurate measure to obtain the temperature distribution and heat transfer. However, no significant results have been obtained successfully, because when higher order finite element methods are used the more computational efforts are necessary due to the distribution of elements. The results of this study are as follows ; 1 . In case of a=b=L, meshes for less than $1\%$ relative errors (temperature distribution) acquired in various methods to exact solution are $2\times2,\;4\times4,\;8\times8\;and\;8\tiems8$ for each FEM 10, FEM 6, FEM 3 and FDM and a=L, b=1/2L are $10\times5$ for each FEM 3 and FDM. And the tendency of results acquired of heat transfer is similar to those above. 2 . In computational efforts (a=b=L), FEM 6 has taken 21 times. and FEM 10 154times FEM 3 and FDM and FEM 3 is the sane as FDM.
A segregated finite element method based on SIMPLE algorithm has been developed in order to solve three dimensional flows around a blunt body. This study is the extension of the two dimensional segregated finite element algorithm proposed by Choi & Yoo (1994). For the validation of the algorithm, steady flows around a sphere are solved at various Reynolds numbers. The results agree well with the existing numerical and experimental results. For the analysis of turbulent flow, κ-ω model is adopted for the present algorithm. The turbulence model is tested by solving a pipe flow at Re = 40,000. Lastly, turbulent flows around an Ahmed model are solved for various shapes and the results are compared with the existing experimental and numerical results.
In this paper, the heat and fluid flow analysis of an ice thermal storage system has been performed for various ice-ball configurations in order to investigate the efficiency of the ice thermal storage system. It has been shown that the donut with bar type ice ball has a higher heat exchange rate than others. Furthermore, the effect of ice packing ratio and the inlet velocity of brine on the heat exchange rate is to be discussed.